Threaded fastener

Details Threaded fastener Threaded fastener

F - Mech Eng,Light,Heat,Weapons

16

B

85/101, 81/32

F16B 23/00 (2006.01)

Patent

CA 1056184

ABSTRACT A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90° angular spacings, the bases of the grooves lying on a conical (or pyramidal) surface and wherein the included angle at the vertex of such cone (or pyramid) has a value within the range 40°-45°, the preferred value of being 40°.

257184

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